Changes in nitrogen content and isotopic composition in subarctic Empetrum nigrum seeds in the period 1976–2010

1) Dating Laboratory, FMNH, FI-00014 University of Helsinki, Finland 2) Natural Environment Centre, Finnish Environment Institute, FI-00251 Helsinki, Finland (corresponding author’s e-mail: [email protected]) 3) Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland 4) Urheilutie 30, FI-79600 Joroinen, Finland 5) School of Geosciences, University of Edinburgh, Crew Building, The King’s Buildings, West Mains Road, Edinburgh EH9 3JN, UK